Professional misconduct by medical professionals includes conduct that would be regarded as disgraceful or dishonorable by other medical professionals. Professional negligence occurs when a medical practitioner fails to exercise reasonable care and skill in treating a patient, causing injury or death. To prove civil negligence, it must be shown that the practitioner had a duty of care, breached that duty through lack of proper skill or care, directly causing damage that could reasonably have been foreseen. Criminal negligence involves an extreme departure from the standard of care, and rarely occurs, typically being limited to cases where the patient has died. Various Supreme Court guidelines outline what does and does not constitute negligence, such as differences of opinion between practitioners not being considered negligence.